gentoo-sources-2.6.30-r3 released, all 2.6.30-rX users should update
gentoo-sources-2.6.30-r3 contains a fix for a security flaw that also comes complete with some exploit code.
Apparently, it only affects 2.6.30 so if you gentoo-sources-2.6.30 please upgrade to r3.
I just committed it, so it should hit the mirrors soon after I post this.
Thanks to everyone who brought to my attention and thanks kerframil for the links below that provide additional information.
http://isc.sans.org/diary.html?storyid=6820
http://lists.immunitysec.com/pipermail/dailydave/2009-July/005810.html
http://www.youtube.com/watch?v=UdkpJ13e6Z0